8. Which activity is an example of a chemical change? a)dissolving table salt in water
b)hammering aluminum into thin sheets
c)melting gold to make jewelry
d)burning wood to produce ashes

Which of these statements is true about autotrophs, but not heterotrophs? a. they use sugar and oxygen to make carbon dioxide and water.b. they use chlorophyll and oxygen to make carbon dioxide and water.c. they use sunlight, water, and carbon dioxide to make sugars.d. they use sunlight, water, and oxygen to make chlorophyll.